1st answer will be brainliest surface currents are caused by a- differences in water temperature b- high salinity c- differences in density d- wind forces

D wind forces

D wind forces                         
D wind forces '

Kinetic energy = 1/2mv^2. since the mass is constant we can form a ratio of it's kinetic energy at 60 divided by that at 30 to see ke(60)/ke(30) = +(60^2)/30^2). this may be said to 300% increase.

It's because 3 if it was 10 it wouldn't look right do it goes up to 4d